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STMicroelectronics LM2903BYST
- Part No.:
- LM2903BYST
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2903BYST.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LM2903BYST from STMicroelectronics is a low-power dual voltage comparator IC designed for automotive and industrial applications requiring wide supply range, rail-to-rail input capability, and robust output drive. It operates from 2 V to 36 V single supply (or ±1 V to ±18 V dual), delivers 250 mV typical output saturation voltage at 4 mA sink, features 20 nA typical input bias current, and supports –40 °C to +125 °C operation with AEC-Q100 qualification.
For engineers reviewing the LM2903BYST datasheet, LM2903BYST pinout, LM2903BYST application, or LM2903BYST equivalent, this device is selected for precision threshold detection in battery management systems, overvoltage protection circuits, and automotive sensor interface designs where input common-mode range includes the negative rail and TTL/CMOS-compatible open-collector outputs are required.
Technical Context
The LM2903BYST implements two independent PNP-input comparators with internal clamping diodes enabling input voltages up to 40 V beyond the negative rail. Its input stage allows common-mode voltage down to VCC–, supporting ground-referenced sensing without level-shifting circuitry.
Output stages are open-collector NPN transistors capable of sinking up to 22 mA at 5 V supply and 13 mA at 36 V supply, with propagation delays under 1 µs for small-signal steps and <500 ns for large-signal TTL-compatible transitions. Electrical characteristics are fully specified across –40 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply - enables direct connection to 12 V/24 V automotive batteries without regulation. |
| Input Offset Voltage | 4 mV min / 5 mV typ - ensures accurate threshold detection with ≤5 mV error at room temperature. |
| Input Bias Current | 20 nA typ - minimizes loading on high-impedance reference or sensor sources. |
| Output Sink Current | 22 mA max at 5 V - drives LEDs, relays, or logic inputs directly without external buffers. |
| Propagation Delay | 1.0 µs typ (small signal) - supports response to fast transients in motor control or fault detection. |
| Common-Mode Input Range | VCC– to VCC–1.5 V - accepts signals referenced to ground even when VCC = 36 V. |
| ESD Rating (HBM) | 800 V (SO-8/MiniSO-8) - meets basic automotive ESD immunity requirements per ISO 10605. |
Pinout & Package
LM2903BYST is packaged in MiniSO-8 (3 mm × 3 mm, 0.65 mm pitch), a space-constrained surface-mount package with wettable flanks for automated optical inspection. Pin functions are identical across SO-8, TSSOP-8, and DFN8 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out1) | Comparator 1 output | Open-collector NPN drain - requires external pull-up to define logic HIGH level and sink current up to 22 mA. |
| 2 (In1–) | Comparator 1 inverting input | PNP-base input node - draws 20 nA reverse-biased current; accepts voltages down to –0.3 V relative to VCC–. |
| 3 (In1+) | Comparator 1 non-inverting input | PNP-base input node - same bias and voltage range as In1–; differential input voltage rating ±40 V. |
| 4 (VCC–) | Negative supply / ground reference | Return path for both comparators and internal bias network; common-mode range extends to this pin. |
| 5 (In2+) | Comparator 2 non-inverting input | Independent PNP input - electrically isolated from In1±; supports separate reference or sensor inputs. |
| 6 (In2–) | Comparator 2 inverting input | Independent PNP input - enables dual-threshold or window-comparator configurations without cross-talk. |
| 7 (Out2) | Comparator 2 output | Open-collector NPN drain - independently controllable; shares no internal nodes with Out1. |
| 8 (VCC+) | Positive supply | Power input for both comparators; supplies internal bias and output stage - rated up to 40 V absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes VCC–, enabling direct ground-referenced signal comparison without level shifters. |
| Low quiescent current | 0.4 mA typ at 5 V - reduces power consumption in always-on automotive modules (e.g., door latch sensors). |
| High-voltage tolerance | 40 V absolute maximum supply - supports direct connection to 24 V truck battery systems with margin. |
| TTL/CMOS/MOS compatible outputs | Open-collector outputs with 22 mA sink capability - interface directly with legacy logic families and microcontroller GPIOs. |
| AEC-Q100 qualified | Grade 1 (–40 °C to +125 °C) - validated for engine bay, transmission, and body control module environments. |
Applications
| Level Shifter | Threshold Detector |
|---|---|
|
Use Scenario: Converting 3.3 V logic signals to 12 V automotive bus levels for actuator control. IC Role / Device Role / Timing Role: Dual comparator configured as voltage translator with hysteresis, using VCC+ = 12 V and reference divider on In1+. Use Value: Eliminates need for discrete transistor level-shifting networks while maintaining noise immunity via adjustable hysteresis. |
Use Scenario: Detecting battery overvoltage (>14.8 V) in 12 V starter battery monitoring systems. IC Role / Device Role / Timing Role: Comparator 1 monitors battery voltage against precision 1.25 V reference (via resistor divider); Out1 triggers warning flag. Use Value: 5 mV offset ensures trip point accuracy within ±0.1 V at 14.8 V, critical for lead-acid charge termination. |
| Zero-Crossing Detector | Sampling Circuit |
|
Use Scenario: Synchronizing microcontroller ADC sampling to AC line zero crossings in smart metering. IC Role / Device Role / Timing Role: Comparator 2 compares AC-coupled mains waveform to ground (VCC–), generating clean digital edge at each crossing. Use Value: Input bias current <20 nA prevents waveform distortion; 1 µs propagation delay enables sub-10 µs timing resolution at 50/60 Hz. |
Use Scenario: Enabling analog multiplexer channel selection based on sensor voltage thresholds in HVAC control units. IC Role / Device Role / Timing Role: Dual comparators generate enable pulses for two independent analog switches when respective sensor outputs exceed setpoints. Use Value: Independent inputs allow simultaneous monitoring of temperature and humidity thresholds without shared reference errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DT | SO-8 package, same electrical specs but non-automotive grade (–40 °C to +125 °C not AEC-Q100 qualified) | Lacks automotive qualification; unsuitable for safety-critical vehicle subsystems | Select when cost-sensitive industrial applications require identical performance without automotive certification. |
| TLV3702IDR | Rail-to-rail input/output, 1.8 V to 16 V supply, 85 µA supply current, 1.5 mV offset - lower power but narrower voltage range | Not rated for >16 V operation; insufficient for 24 V truck systems or unregulated battery inputs | Choose for ultra-low-power portable equipment where supply is regulated ≤16 V and offset <2 mV is mandatory. |
Compared with LM2903DT, LM2903BYST adds AEC-Q100 qualification and tighter production screening; versus TLV3702IDR, it trades higher quiescent current for 36 V operation and proven automotive reliability - making it the only option for 12/24 V battery-connected threshold detection in vehicles.
Availability
LM2903BYST is available at Aetrix Electronics and suitable for automotive battery management, industrial overvoltage protection, and sensor interface designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM2903BYST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The LM2903B series belongs to ST's precision analog comparators product line, engineered specifically for automotive-grade signal conditioning where wide supply range, rail-to-rail input, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum supply voltage for LM2903BYST?
The absolute maximum supply voltage is 40 V, with recommended operating range from 2 V to 36 V single supply. Operation above 36 V is permissible only for transient conditions within the absolute maximum ratings - sustained operation at 40 V is not characterized and may impact long-term reliability. The device is fully specified at 5 V and 36 V for all key parameters including offset voltage, propagation delay, and output sink current.
Can LM2903BYST drive a 5 V logic input directly?
Yes - its open-collector outputs can sink up to 22 mA at 5 V supply, sufficient to drive standard TTL or CMOS inputs when paired with a 5 V pull-up resistor. For guaranteed logic LOW, use RPULLUP ≤ 2.2 kΩ (ensuring VOL ≤ 0.4 V at ISINK = 2 mA). No level-shifting circuitry is needed, and the output remains compatible with 3.3 V microcontrollers when pulled to their I/O voltage.
Does LM2903BYST require external hysteresis for noise immunity?
Hysteresis is not built-in and must be added externally via positive feedback (e.g., resistor from Out1 to In1+). This is standard practice for comparator-based threshold detection. The low input bias current (20 nA typ.) ensures hysteresis resistors can be large (e.g., 1 MΩ) without significant offset error, preserving accuracy while rejecting noise spikes below the hysteresis window.
Is the MiniSO-8 package of LM2903BYST compatible with automated optical inspection (AOI)?
Yes - the MiniSO-8 variant (LM2903BYST) uses wettable flank terminations, enabling reliable solder joint inspection via side-view AOI systems. The package's 0.65 mm pitch and defined flank geometry meet IPC-7351B standards for automated assembly verification, supporting high-yield SMT lines in automotive electronics manufacturing.
LM2903BYST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 4mV @ 36V
- Voltage - Input Offset (Max):
- 0.15µA @ 36V
- Current - Input Bias (Max):
- 22mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C (TA)
- Operating Temperature:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- 8-MiniSO
LM2903BYST FAQ
1.How can I place an order for LM2903BYST through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903BYST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2903BYST reliable?
The price and inventory of LM2903BYST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903BYST is usually 5 days.
3.What payment methods are accepted for LM2903BYST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903BYST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903BYST?
LM2903BYST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903BYST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2903BYST?
For technical support, including LM2903BYST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903BYST requirements.
6.How does Aetrix verify that LM2903BYST is sourced from the original manufacturer or authorized distributors?
All LM2903BYST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2903BYST meets industry standards.
7.What is the process for return or replacement of LM2903BYST?
All LM2903BYST units undergo pre-shipment inspection (PSI). If there is an issue with LM2903BYST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2903BYST part is unused and in its original packaging.
Return procedure for LM2903BYST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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